﻿//  Author:
//       Daniel Großer <olav.daniel.grosser@googlemail.com>
//  
//  Copyright (c) 2012 Copyright (C) 2012 by Daniel Großer. This Code is under GNU LGPL 3.0
// 
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
// 
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
// 
//  You should have received a copy of the GNU Lesser General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System;
using System.Collections.Generic;
using System.Linq;
using Beauty.Contract;
using System.Reflection;

namespace Beauty.Tools
{
    /// <summary>
    /// This class provides a language by getting all types implementing INode from an assembly.
    /// </summary>
    public class AssemblyLanguageProvider : ILanguageProvider
    {
        /// <summary>
        /// Create a new instance.
        /// </summary>
        /// <param name="languageAssembly">The assembly holding all INode implementations.</param>
        public AssemblyLanguageProvider(Assembly languageAssembly)
        {
            LanguageAssembly = languageAssembly;
        }

        /// <summary>
        /// The assembly providing the INode classes.
        /// </summary>
        public readonly Assembly LanguageAssembly;

        /// <summary>
        /// Get the set of abstract syntax tree node types that define a language.
        /// </summary>
        public virtual IEnumerable<Type> AbstractSyntaxTreeNodes
        {
            get
            {
                return LanguageAssembly.GetTypes().Where((t) => typeof(INode).IsAssignableFrom(t));
            }
        }
    }
}
